Push bench guide



Nb'v. 6,1934. SMITH I 1,979,579

. PUSH BENCH GUIDE Filed March 9, 1928 5 Sheets-Sheet 1 itfl amen tom Nov. 6, 1934. 8. SMITH PUSH BENCH GUIDE Filed March 9, 1928 5 Sheets-Sheet 2 Nov. 6, 1934.-- s SMTH 1,979,579

' PUSH BENCH GUIDE Filed March 9, 1928 v I 5 Sheets-Sheet 3 Nov. 6, 1934. s. SMITH PUSH BENCH GUIDE 5 Sheets-Sh set 4 Filed March 9, 1928 9% \N NW 9% m Nov; 6, 1934. sj SMITH 1,979,579

PUSH BENCH GUIDE I 1 Filed March 9, 1928 5 Sheets-Sheet 5 pay/2 Patented Nov. 6, 1934 UNITED STATES 1' OFFICE PATEN PUSH BENCH GUIDE Sydney Smith, London, England, assignor, by direct and mesne assignments, of one-halfto The Wellman Seaver Rolling Limited, London, Britain,

Mill Company,

England, a company of Great and one-half to Pressund Walzwerk Aktiengesellschaft, Dusseldorf-'Reisholz, Germany, a German company Application March 9, 1928, Serial No. 260,435

In Great Britain May 11, 1927 14 Claims.

This invention has relation to the manufacture of metal tubes and other tubular metal articles, hereinafter referred to as tubes, in which there is employed in one of the steps of the manufacture drawing apparatus of the push bench type, that is to say, drawing apparatus by which a somewhat thick cup-shaped hollow billet carried on an end of a mandrel is pushed through dies or through passes between rolls which decrease successively in cross' sectional area in a forward direction, whereby the billet is reduced in thickness and is spread out lengthwise along the rnandrel until the billet is brought to, or approximately to, the form of a tube of the requiredthickness and length.

Heretofore, in tube drawing'apparatus of the push bench type, the mandrel and the mandrel carrying bar, hereinafter called the mandrel carrier, have been supported in guides or bearings movable longitudinally of the push bench, at the same time as the racks, the several guides or bearings being bunched together as themandrel and mandrel carrier are moved in one direction and separated as the mandrel carrier is moved in the other direction. The employment of guides or bearings that move with the mandrel and mandrel carrier has certain disadvantages and objections in practice and it is the object f this invention to provideimprovements in dra ing apparatus of the push bench type by means of which the disadvantages and objections are overcome and certain advantages are obtained.

In drawing apparatus of the push bench type, in accordance with this invention, the -mandrel and mandrel carrier are mounted to travel in a path which is clear of the path of movement of the rack or racks by which the mandrel and mandrel carrier are operated.

Further, in drawing apparatus'of the push bench type, in accordance with this invention, the mandrel and rnandrel carrier are supported in, and guidedby, bearings which are fixed as regards position. v

Referring now to the accompanying five sheets of drawings, on each of which a constructional embodiment of the invention is illustrated.

Fig. -1 is a purely diagrammatic and illustrative view and shows a push bench having atone end a plurality of dies andat the other end mechanism to operate two racks which are connected through an equalizing bar to the mandrel carrier and mandrel. To enable the meshmg of the final member of the operating mechanism with the racks to be clearly illustrated, the racks are shown inverted.

Fig. 2 is a plan view of a part of a push bench, only so much of whichis shown as is necessary to illustrate the invention;

Figs. Band 4 are sections on the lines 33 and 44, respectively, of Fig. 2;

Fig. 5is a cross sectional diagrammatic view of a push bench in which only one rack is employed; and

Figs. 6 and -'7 are diagrammatic views which show the manner in which parts of the bearings can be moved to permit the insertion of a new mandrel.

Referring now to Figs. 1 to 4 inclusive.

The push'bench comprises two side members 11, an intermediate member 12 and two trough shaped members 13, each of which is intermediateand unitary with a side member 11 and the intermediate member .12. The upper part of the intermediate member 12 is constituted as a .trough 14. The troughs 13, 14 extend from end to end of the push bench, at one end of which is the mechanism 15 by which the mandrel carrier 16 and mandrel 17. are propelled and at the other end the dies 18 by which the billet 19 placed onJthe free end of the mandrel 17 is ,elongated to tube formation. 20, 20 are the racks through which the mechanism 15 operates the mandrel carrier 16 and mandrel 17. The racks 20, of which there are two, as seen in section or end view are of T shape and each is positioned over a trough 13, being supported by engagement of. its cross member with a cut away portion 21 of the side member 11 and the upper part of the intermediate member 12. 22; 22 are the final members of the mechanism and these gear with the racks, 20, 20. 23 is a bar ,or beam which is articulated at its ends to the racks 20 and intermediately is provided with a socket 24 in which the one end of the mandrel carrier 16 is secured. The other end of the mandrel carrier 16 is disconnectably connected with the mandrel 17 in any convenient way. '25,

26 .are the two halves of bearings in whichthe mandrel carrier and mandrel are supported and guided. The lower half bearing 25 is fixedly mounted within the trough 14 and the upper half bearing 26 is in two parts mounted in and carried by bridge members. The mandrel car- 'rier 16 and mandrel 17 are thus supported above the racks and in -a plane'which passes vertically between the racks. The mandrel carrier 16 and mandrel 17 are further so supported that the equalizing baror beam 23 passes between the .mounted at one end on anaxle 29 carried in bearings 30 on the adjacent 1 side member 11 and at the other end are connected to a bar 31. The bar 31 is connected at its ends to the pistons o r rams '32 of hydraulic cylinders 33. When hydraulic pressure is admitted to or cut off from the cylinders 33, the bridge members 28 are turned about their axle 29 and the'movable upperhalf bearing 26 is raised or lowered: When the upper half bearing 26 is raised, a new mandrel l'lcan berolled or pushed into posi- -tion on the lower half bearing 25. The new mandrels 17 are carried on a platform or structure 34, on the front edge of which a series of. counterweighted arms 35 is mounted. These arms are of a length to extend to and rest on .the intermediate member 12 andconstitute bearers for the mandrels 17 when being moved from the'platform or structure 34 to the half bearings 25.

The lower bearing 25 is continuous from end to end of the push bench and the upper bearing 26 is made in two parts, the division or break being at a position to permit the insertion of a new mandrel as illustrated in Figs. 5 and 6 of the drawings.

Referring now to Figs. 5 m9 inclusive.

In this embodiment, only a single rack 20v is employed. This rack is of T-shape in section or end view and is supported by the engagement of the ends of its cross member with cut away portions 21 in the upper partsof the side members 11. The rack 20 is coupled at its forward end to the rearward end of themandrel carrier 16 by the socket 24. The mandrel carrier 16 and. mandrel 17 are supported and guided by a continuous bearing which is mounted on a base member 36- of the push bench below and clear of the racks 20 and is made to embrace almost wholly the mandrel carrier and mandrel and so as to provide for the passage of the member 24 by which the rack 20 is coupled to the mandrel carrier 16. The continuous bearing, like that of Figs. 1 to 6 inclusive, may-be regarded as consisting of two'parts, i. e. that which is oppositeto the mandrel carrier 16 and that which is opposite to the mandrel 17 when in the positions they occupy when ready to commence their forward-stroke. The bearing is constituted by a tube 43 which is slotted at the top to permit the rack to travel forward. Said tube is carried in pedestals 3'7, 38. One half of the bearing is continuous and extends from one end to the other of the bench and the other half is in two parts which-together form a continuous bearing, the part which receives the mandrel carrier when in its withdrawn or initial position being integral with the first half of the bearing and the other part 44 which receives the mandrel in such position being carried by :the parts 3'? of the pedestals. The parts 3'? are movable in relation to the parts 38 which are fixed in position. The movable parts 37 are mounted on slides 39 and are moved to and fro thereon from a shaft 46 through cranks 41 and links 42. When the shaft 40 is rotated, the parts 3'7 are withdrawn so as to permit a new mandrel 17 to be pushed forward down the tracks 45 towards the'half bearing carried by the parts 38. As the shaft 40 continues its rotation the parts 37 are advanced and the mandrel-is supported in the tubular bearing 43.

What I claimis:

. 1. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles, a mandrel carrier and mandrel, a bearing therefor which is continuous throughout the length of the bench, said bearing being made in two parts, one of which is disposed above and the other below the mandrel and the mandrel carrier, said bench having side members with bridge pieces thereacross above said mandrel and mandrel carrier, those bridge pieces above the mandrel when the mandrel carrier is within its withdrawn or initial position being movable as a unit, while the remaining bridge pieces are fixedly mounted, the upper part of the bearing being carried by the said bridge pieces and being made in two pieces in respect to its length, and one of said upper bearing pieces being movable withthe movable bridge piece, for the purpose described. 2. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular metal articles, a. mandrel carrier and mandrel, a bearing which engages the mandrel continuously throughout the length of the bench, said bearing being split longitudinally to form bearing portions side by side which portions only partly embrace the mandrel and mandrel carrier, a, rack for operating the mandrel:

and mandrel carrier, the bearing portions being positioned clear of the path of travel of the rack,

one of the bearing parts made in two-pieces in respect to its length and mounted on-slides, and

means to move the said slides and the bearing portion carried thereby, for the purpose de-' scribed.

3. A drawing apparatus for the manufacture of metal tubes and other tubular articles comprising, a push bench having side members throughout its length, an intermediate member extending throughout the length of the push bench, troughs extending throughout the length of the push bench and being positioned intermediate the bench side members and said intermediate member, a mandrel and mandrel carrier mounted for reciprocation upon said intermediate member, a pair of driven racks having connection with said mandrel carrier, said racks being of a T-shape .in cross-section, the heads of said T-shaped racks having sliding engagement with the bench side members and the intermediate member, and the legs of said T-shaped rack members travelling in said troughs.

4. A drawing apparatus for the manufacture of metal tubes and other tubular articles comprising, a push bench having side members, an intermediate member extending lengthwise of said bench, a mandrel carrier and mandrel mounted for reciprocation upon said intermediate member, a pair of. driven racks connected to said mandrel carrier for reciprocating the same, and said racks having sliding engagement with the said bench side members and said intermediate member, for the purpose described.

5. A drawing apparatus for the manufacture of metal tubes and other tubular articles comprising, a push bench having side members throughout its length, an intermediate member extending throughout the length of the push bench, a mandrel carrier and mandrel, a bearing mounted upon said intermediate member and continuous throughout its length for reciprocally supporting the mandrel and mandrel carrier, a series of fixed bridge members above the bench carrying a bearing adapted to engage the mandrel and mandrel carrier, a series of pivotally mounted bridge members carrying a bearing adapted to engage the mandrel and mandrel carrier, and means to reciprocate'said mandrel and mandrel carrier, all for the purpose described. 1

6. A drawing apparatus for the manufacture of metal tubes and other tubular articles comprising, a push bench having side members and an intermediate member extending lengthwise of the bench, a mandrel and mandrel carrier, driven racks for reciprocating said -mandrel and. mandrel carrier, a trough in said intermediate member, a bearing which is continuous throughout the length of the bench mounted in.said trough for reciprocally supporting and engaging the under sides of said mandrel and mandrel carrier, a series of bridges above said bench carrying bearings extending throughout the length of the bench adapted to engage the upper sides of said mandrel and mandrel carrier, and said racks having sliding engagement with the bench side members, the intermediate member and the lower faces of said bridge members, for the purpose described.

'7. A drawing apparatus for the manufacture of metal tubes and other tubular articles comprising, a push bench having side members, an intermediate member extending lengthwise of the push bench and being shorter as to height than said bench side members, a mandrel'and mandrel carrier reciprocally supported upon said intermediate member, a pair of driven racks positioned at each side of said mandel carrier and having connection with the end of said mandrel carrier through the medium of a crossbeam, a series of bridges above said bench carrying bearings extending throughout the length of the bench engaging said mandrel and mandrel carrier, the lower faces of said bridges terminating in the same horizontal plane as the upper ends of said bench side members, said bench side members having longitudinally extending shoulders in their inner faces in the same horizontal plane as the top of said intermediate member, said racks slidably supported upon the shoulders of said bench side members and the top of said intermediate member, and the crossbeam connecting said racks with said mandrel carrier occupying and free to reciprocate in the space between the top of said intermediate member and the lower faces of said bridge members.

8. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular metal articles, a mandrel carrier and a mandrel, a centrally arranged member extending thoughout the length of said bench, a continuous bearing carried by said centrally arranged member for reciprocally supporting said mandrel and mandrel carrier, a series, of bridge members mounted above said bench and at a point abovethe mandrel and mandrel carrier provided with semi-circular shaped depressions carrying a semi-circular shaped bearing for engaging the top surface of said mandrel and mandrel carrier, 2. series of said bridges being mounted stationarily, a series of said bridges pivotally supported upon the bench, and the bearing mounted in the bridges divided into two parts in respect to its'length, one of said bearing parts being positioned in the stationary bridges and the other bearing part in the movable bridges, for the purpose described.

9. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles a mandrel carrier, a mandrel and a bearing to support and guide said mandrel and mandrel carrier, of which one half is continuous and extends from one end to the other of the bench and the other half of the bearing is itself in two parts which together form a continuous bearing, the part which, engages the mandrel carrier inits withdrawn position being fixed in relation to the one half of the bearing and the other part being movable away from the one half of the bearing to permit the introduction of a new mandrel.

10. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles a mandrel carrier, a mandrel and a bearing to support and guide said mandrel and mandrel carrier of which one half is continuous and extends from one end to the other of the bench and the other half of the bearing is itself in two parts which together form a continuous bearing, the part which engages the mandrel carrier in its withdrawn position being fixed in relation to the one half of the bearing, pivotally mounted bridge members carrying the other part of the other half of the bearing and operating means to move the bridge members to move the other part of the half bearing away from the one half of the bearing to permit the introduction of a new mandrel.

11. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles a mandrel carrier, a mandrel and a bearing to support and guide said mandrel and mandrel carrier of which one half is continuous and extends from one end to the other of the bench and the other'half of the bearing is itself in two parts which together form a continuous bearing, the part which engages the mandrel carrier in its withdrawn position being fixed in relation to the one half of the bearing, slides on which the other part is mounted and means to move it on said slides away from the one half of the bearing to permit the introduction of a new mandrel.

12. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles a mandrel carrier, a'mandrel and a bearing to support and guide said mandrel and mandrel carrier of which one half' crank and a link connecting the crank to the said other part of the bearing. 13. In a drawing apparatus of the push bench type for the manufacture of metal tubes and other tubular articles a mandrel carrier, a mandrel and a bearing. to support and guide said mandrel and mandrel carrier of which one half is continuous and extends from one end to the .other of the bench and the other half of the bearing is disposed to provide a slot between the two parts for the passage ofa member connecting a driving rack with the mandrel carrier and is itself in two parts which together form a continuous' bearing, the part which engages the mandrel carrier in its withdrawn position being fixed in relation to the one half of the bearing and the other part being movable away from the one half 01 the bearing to permit the introduc tion of a new mandrel.

guiding said mandrel and shaft and adapted to permit a free passage of said driving machine part therealong.

SYDNEY SmTH.

csnrmcmt or coRnEcrioN.

mm No. 1,979, 519.

November 6, 1934.

SYDNEY SMITH.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, after line 69,

insert the following paragraphs:

Figure 8 is a longitudinal section of the first form of apparatus shown in figure 5, 6 and 7.

Figure 9 is a side view, partly in section ofthe device shown in figure 5.

And that the said Letters Patent should be read with these corrections therein that the same may conform to therecord of the case in the Patent Office.-

Signed and lealed this 5th day of February, A. D. 1935.

sun

Leslie Frazer is continuous and extends from one end to the .other of the bench and the other half of the bearing is disposed to provide a slot between the two parts for the passage ofa member connecting a driving rack with the mandrel carrier and is itself in two parts which together form a continuous' bearing, the part which engages the mandrel carrier in its withdrawn position being fixed in relation to the one half of the bearing and the other part being movable away from the one half 01 the bearing to permit the introduc tion of a new mandrel.

guiding said mandrel and shaft and adapted to permit a free passage of said driving machine part therealong.

SYDNEY SmTH.

csnrmcmt or coRnEcrioN.

mm No. 1,979, 519.

November 6, 1934.

SYDNEY SMITH.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, after line 69,

insert the following paragraphs:

Figure 8 is a longitudinal section of the first form of apparatus shown in figure 5, 6 and 7.

Figure 9 is a side view, partly in section ofthe device shown in figure 5.

And that the said Letters Patent should be read with these corrections therein that the same may conform to therecord of the case in the Patent Office.-

Signed and lealed this 5th day of February, A. D. 1935.

sun

Leslie Frazer 

